Central Islip, NY frost dates
Last spring frostApr 10median date
First fall frostNov 2median date
Growing season206 daysfrost-free
Hardiness zone7bZone 7b
How Central Islip compares
- In 8 years out of 10, the last spring frost in Central Islip falls between March 31 and April 25, a 25-day window. The first fall frost falls between October 18 and November 15.
- The median last frost is 23 days earlier than the New York median of May 3.
- Its 206-day growing season is longer than 89% of the 1,610 New York places with a regular frost season (state median 163 days).
- The last frost is 5 days later than the zone 7b median of Apr 5. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 7b chart.
- The weather station records an average of 98 nights a year at or below 32°F.
- Central Islip shares its weather station with Brentwood, NY, 5 km away, so the two have the same frost dates.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 31 |
| 50% (median) | April 10 |
| 10% (safe for tender plants) | April 25 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 18 |
| 50% (median) | November 2 |
| 90% (late) | November 15 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Central Islip, NY
Central Islip, NY frost dates — last frost Apr 10, first frost Nov 2, zone 7b. whenisthelastfrost.com
Crop
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Start indoors: Jan 16 to Jan 30Transplant outside: Mar 13 to Mar 27
Start indoors: Jan 30 to Feb 13Transplant outside: Apr 24 to May 8
Start indoors: Jan 30 to Feb 13Transplant outside: Apr 24 to May 8
Start indoors: Feb 13 to Feb 27Transplant outside: Apr 17 to May 1
Start indoors: Feb 13 to Feb 27Transplant outside: Mar 20 to Apr 3Sow outdoors: Mar 13 to Apr 17Plant for fall: Sep 7 to Oct 5
Start indoors: Feb 13 to Feb 27Transplant outside: Mar 13 to Mar 27Sow outdoors: Mar 13 to Mar 27Plant for fall: Aug 24 to Sep 14
Start indoors: Feb 13 to Feb 27Transplant outside: Mar 27 to Apr 10Plant for fall: Jul 27 to Aug 17
Start indoors: Feb 13 to Feb 27Transplant outside: Mar 20 to Apr 3Plant for fall: Jul 27 to Aug 17
Start indoors: Feb 13 to Feb 27Transplant outside: Mar 27 to Apr 10Plant for fall: Jul 27 to Aug 17
Start indoors: Feb 27 to Mar 13Transplant outside: May 1 to May 15Sow outdoors: May 1 to May 15
Start indoors: Feb 27 to Mar 13Transplant outside: Apr 17 to May 1
Sow outdoors: Feb 27 to Mar 20Plant for fall: Aug 10 to Aug 31
Sow outdoors: Feb 27 to Mar 20Plant for fall: Sep 7 to Sep 28
Sow outdoors: Mar 6 to Apr 17Plant for fall: Sep 21 to Oct 12
Start indoors: Mar 13 to Mar 20Transplant outside: Apr 24 to May 1Sow outdoors: Apr 17 to May 1Plant for fall: Aug 17 to Aug 31
Start indoors: Mar 13 to Mar 20Sow outdoors: Apr 17 to May 1Plant for fall: Aug 24 to Sep 7
Start indoors: Mar 13 to Mar 20Sow outdoors: Apr 17 to May 1
Start indoors: Mar 13 to Mar 20Transplant outside: Apr 24 to May 8
Sow outdoors: Mar 20 to Apr 17Plant for fall: Aug 10 to Aug 24
Sow outdoors: Mar 20 to Apr 17Plant for fall: Aug 24 to Sep 7
Sow outdoors: Mar 20 to Apr 10
Sow outdoors: Mar 27 to Apr 24Plant for fall: Aug 24 to Sep 7
Sow outdoors: Mar 27 to Apr 17Plant for fall: Sep 7 to Sep 28
Sow outdoors: Apr 17 to May 8Plant for fall: Aug 17 to Aug 31
Sow outdoors: Apr 17 to May 1
Transplant outside: Apr 24 to May 15
Plant for fall: Oct 19 to Nov 23
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Central Islip, NY
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 16 – Jan 30 | Mar 13 – Mar 27 | — | — |
| Peppers | Jan 30 – Feb 13 | Apr 24 – May 8 | — | — |
| Eggplant | Jan 30 – Feb 13 | Apr 24 – May 8 | — | — |
| Tomatoes | Feb 13 – Feb 27 | Apr 17 – May 1 | — | — |
| Lettuce | Feb 13 – Feb 27 | Mar 20 – Apr 3 | Mar 13 – Apr 17 | Sep 7 – Oct 5 |
| Kale | Feb 13 – Feb 27 | Mar 13 – Mar 27 | Mar 13 – Mar 27 | Aug 24 – Sep 14 |
| Broccoli | Feb 13 – Feb 27 | Mar 27 – Apr 10 | — | Jul 27 – Aug 17 |
| Cabbage | Feb 13 – Feb 27 | Mar 20 – Apr 3 | — | Jul 27 – Aug 17 |
| Cauliflower | Feb 13 – Feb 27 | Mar 27 – Apr 10 | — | Jul 27 – Aug 17 |
| Okra | Feb 27 – Mar 13 | May 1 – May 15 | May 1 – May 15 | — |
| Basil | Feb 27 – Mar 13 | Apr 17 – May 1 | — | — |
| Peas | — | — | Feb 27 – Mar 20 | Aug 10 – Aug 31 |
| Spinach | — | — | Feb 27 – Mar 20 | Sep 7 – Sep 28 |
| Radishes | — | — | Mar 6 – Apr 17 | Sep 21 – Oct 12 |
| Cucumbers | Mar 13 – Mar 20 | Apr 24 – May 1 | Apr 17 – May 1 | Aug 17 – Aug 31 |
| Zucchini & Summer Squash | Mar 13 – Mar 20 | — | Apr 17 – May 1 | Aug 24 – Sep 7 |
| Winter Squash & Pumpkins | Mar 13 – Mar 20 | — | Apr 17 – May 1 | — |
| Melons & Watermelon | Mar 13 – Mar 20 | Apr 24 – May 8 | — | — |
| Carrots | — | — | Mar 20 – Apr 17 | Aug 10 – Aug 24 |
| Beets | — | — | Mar 20 – Apr 17 | Aug 24 – Sep 7 |
| Potatoes | — | — | Mar 20 – Apr 10 | — |
| Swiss Chard | — | — | Mar 27 – Apr 24 | Aug 24 – Sep 7 |
| Cilantro | — | — | Mar 27 – Apr 17 | Sep 7 – Sep 28 |
| Green Beans | — | — | Apr 17 – May 8 | Aug 17 – Aug 31 |
| Sweet Corn | — | — | Apr 17 – May 1 | — |
| Sweet Potatoes | — | Apr 24 – May 15 | — | — |
| Garlic | — | — | — | Oct 19 – Nov 23 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Islip Li Macarthur Ap, NY weather station, 8 km away (elevation 85 ft (26 m)).
Frost dates near Central Islip
- Islandia Apr 10 · Nov 2
- Islip Terrace Apr 10 · Nov 2
- Hauppauge Apr 10 · Nov 2
- Brentwood Apr 10 · Nov 2
- Ronkonkoma Apr 10 · Nov 2
- Islip Apr 4 · Nov 11
- East Islip Apr 4 · Nov 11
- Great River Apr 4 · Nov 11
- Bohemia Apr 10 · Nov 2
- Smithtown Apr 10 · Nov 2
Frequently asked questions
When is the last frost in Central Islip, NY?
The median last spring frost in Central Islip, NY is April 10. There is still about a 10% chance of frost after April 25, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Central Islip, NY?
The median first fall frost is November 2, with about a 10% chance of frost before October 18.
How long is the growing season in Central Islip, NY?
About 206 days between the median last spring frost and first fall frost.
What planting zone is Central Islip, NY?
Central Islip, NY is in USDA hardiness zone 7b.